Growth Changes in NE Shelf Species

Changes in Size and Weight at Age Across Cohorts

Author
Affiliation

Gulf of Maine Research Institute

Published

August 29, 2023

Decadal Variability in Growth Model Exploration

The following tables show the available data by species for assessing size-at-age changes among species sample by the federal trawl survey. Each row indicates the number of individuals sampled and aged by the survey program. All species aged will have lengths, but some may not have weights, particularly in earlier years.

american plaice

American Plaice - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - american plaice
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980 5 41 118 139 119 75 61 21 22 12 14
1981 14 107 116 154 125 88 54 31 19 18 24
1982 10 58 86 77 56 44 35 25 15 7 8
1983 23 55 102 188 122 85 54 24 10 9 23
1984 1 45 69 84 102 45 16 11 1 2 7
1985 13 38 138 93 83 65 30 31 10 5 9
1986 19 46 62 126 69 41 27 19 4 2 4
1987 37 77 80 65 66 32 20 7 6 2 4
1988 62 107 137 80 49 26 10 2 7 2 3
1989 15 124 160 111 40 28 11 4 10 2 2
1990 21 51 239 157 76 34 12 8 6 4 2
1991 20 81 117 201 125 39 8 4 2 1 3
1992 35 90 179 169 166 63 17 8 5 4 2
1993 89 163 210 178 115 101 26 12 6 5 3
1994 72 208 198 178 142 53 29 14 2 2 4
1995 22 212 317 245 128 50 21 5 4 3 5
1996 40 76 185 301 134 62 18 7 4 2
1997 38 117 171 224 190 51 12 2 1 1 2
1998 85 62 181 205 223 163 33 11 2 2 3
1999 122 161 173 236 189 117 55 17 2 1
2000 27 171 205 181 161 95 69 27 10 5 2
2001 21 60 239 241 152 79 50 28 17 8 2
2002 58 63 116 297 202 71 55 39 27 13 3
2003 25 156 85 152 194 104 45 18 15 10 12
2004 58 74 122 138 104 98 38 15 21 4
2005 70 154 112 133 102 65 28 21 4 6 1
2006 142 236 248 253 150 66 59 25 6 5 4
2007 60 271 276 220 139 57 24 9 2 3 1
2008 69 93 266 281 172 101 46 12 11 5 5
2009 66 157 172 345 340 178 79 32 11 7 5
Warm Regime - american plaice
2010 45 168 191 189 283 205 88 34 22 10 5
2011 131 102 153 181 159 168 147 84 36 15 11
2012 148 221 204 195 186 125 127 95 48 12 17
2013 127 184 213 124 72 136 50 57 45 23 11
2014 258 259 289 233 120 73 125 48 50 37 33
2015 64 632 404 294 197 82 54 81 23 22 39
2016 147 130 707 332 166 114 32 44 57 30 38
2017 20 139 85 442 176 83 50 18 13 28 27
2018 100 40 153 66 246 93 50 34 18 11 40
2019 114 235 76 226 100 227 66 43 17 7 40

atlantic cod

Atlantic Cod - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - atlantic cod
1970 64 54 50 86 37 52 45 8 8 8 14
1971 37 85 44 50 65 25 30 31 16 4 7
1972 249 129 168 32 20 30 11 26 18 5 8
1973 53 535 125 153 40 20 24 14 20 15 26
1974 58 119 293 36 64 18 4 12 4 6 10
1975 48 130 67 196 18 37 3 5 8 2 5
1976 95 99 100 32 103 13 25 3 1 1 5
1977 8 217 79 130 24 89 2 9 1 3 7
1978 129 29 369 115 127 28 61 6 18 2 5
1979 140 281 48 319 89 112 20 37 3 8 5
1980 76 105 142 23 60 28 23 6 10 1 8
1981 162 105 152 128 16 47 11 11 3 8 1
1982 65 216 72 68 68 2 19 5 4 1 1
1983 51 135 162 47 35 24 4 5 2 5 8
1984 79 72 91 94 22 15 11 7 3
1985 34 174 82 81 89 18 10 10 1 4 2
1986 116 63 149 40 36 39 6 4 8 2
1987 52 233 66 73 13 7 13 1 2 3
1988 104 131 236 42 39 9 5 6 1
1989 84 173 132 159 26 21 1 2 2 1 1
1990 27 122 255 93 72 8 11 1 1 1
1991 108 68 87 154 44 19 7 3
1992 65 211 70 38 93 25 15 2 2
1993 57 107 165 30 13 38 9 4 3 2 1
1994 52 154 130 62 20 7 15 5 3 1
1995 26 99 201 70 45 8 5 2 1
1996 34 55 105 181 39 21 2 1
1997 70 87 57 60 93 17 16 2
1998 42 154 110 87 43 53 9 3
1999 82 104 171 94 50 18 22 2 1 1
2000 82 163 98 134 41 15 3 5
2001 13 73 169 68 68 20 13 4 2 1
2002 72 56 121 261 60 51 10 5 1 1
2003 31 114 50 126 145 38 32 6 9 1 2
2004 137 30 132 64 61 53 12 11 4 2
2005 25 164 37 139 25 30 27 5 2
2006 111 72 205 43 93 18 27 16 1 1 2
2007 44 130 76 232 30 47 5 3
2008 72 150 140 57 112 8 11 1 2
2009 169 211 165 112 60 61 4 7 2 1
Warm Regime - atlantic cod
2010 110 167 145 124 52 23 22 2 3 1 3
2011 122 167 104 115 58 31 6 9
2012 78 220 190 118 58 21 12 1 1
2013 35 210 223 99 31 11 4
2014 100 67 122 154 28 10 4 2
2015 82 308 93 160 88 12 3
2016 36 116 426 87 93 21 3 1
2017 40 53 111 299 75 60 12
2018 87 53 52 61 75 3 4 1
2019 61 95 47 46 43 28 1 3

atlantic herring

Atlantic Herring - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - atlantic herring
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987 2 33 64 89 11 9
1988 9 38 19 24 56 15 1
1989 7 71 43 34 33 24 7 3
1990 79 66 62 28 4 1
1991 44 48 78 21 6 1 1
1992 67 102 71 53 13 3 1
1993 3 36 133 129 146 44 8 1
1994 5 126 114 212 225 168 60 13 4 1
1995 53 111 189 88 217 137 68 15 1
1996 9 311 199 131 65 131 93 45 5 1 1
1997 3 37 227 92 78 81 67 20 7
1998 1 189 239 311 104 93 92 42 19 5 1
1999 9 49 240 114 260 109 77 40 11 1
2000 1 186 128 120 127 144 67 27 5 1
2001 4 56 343 53 66 106 129 33 6 4
2002 103 45 64 205 63 91 88 53 14 2
2003 31 276 160 68 168 77 76 53 15 2 1
2004 2 333 328 76 39 81 62 37 26 9 4
2005 6 126 239 139 68 43 60 48 35 15 6
2006 15 48 145 153 129 54 37 32 17 9 2
2007 4 288 161 135 134 116 32 30 8 1
2008 6 24 217 187 84 85 94 42 24 6 1
2009 78 301 266 362 128 88 113 70 26 7 3
Warm Regime - atlantic herring
2010 40 662 516 178 280 50 64 49 21
2011 24 101 626 349 126 133 31 34 10
2012 115 121 127 462 143 76 49 10 4
2013 13 384 203 155 268 63 37 6 1
2014 13 99 484 95 104 239 48 13 3
2015 10 154 150 316 78 98 138 30 6
2016 4 62 208 137 316 69 75 61 10
2017 15 66 148 165 139 246 61 49 13 2
2018 2 28 36 55 66 73 102 23 10 3
2019 33 31 164 56 97 107 92 54 15 6

atlantic mackerel

Atlantic Mackerel - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - atlantic mackerel
1970
1971
1972
1973 45 45 15 14 3 13 9 3 1 7
1974 30 10 12 1
1975 26 13 5 3 2 2 1
1976 13 25 7 4 1 1
1977 3 13 26 15 6 2 1 3 2 2 3
1978 8 18 11 11 2 2 1 1 1
1979 17 4 3 3 13 3 1 2 2 3 4
1980 6 27 2 1 5 10 2 2 1 2
1981 6 6 15 2 2 8 3 2 2
1982 13 8 5 1 1 1 2 4
1983 27 18
1984 1 12
1985 13 9 1 1 1
1986 9 20 3 23 4
1987 26 51 21 7 54 4 2 3
1988 12 20 19 10 2 51 10 1 5
1989 12 27 2 1 4 1
1990 24 36 19 1 2
1991 9 3 10 1 2 5
1992 57 40 11 14 10 1 1 7
1993 27 33 11 6 18 2 1 2 3 1 8
1994 125 42 47 23 8 27 10 4 1 5 14
1995 91 111 22 44 26 5 27 5 3
1996 131 98 47 4 32 26 8 11 10 1
1997 114 60 23 17 1 1 5 1 5 2 1
1998 183 123 36 15 4 2 9 3 1 2
1999 96 112 73 25 16 3 8 4
2000 178 70 36 28 7 4 2 2 1
2001 140 161 20 4 11 3 1
2002 65 77 101 6 4 2 1
2003 135 117 46 59 10 2 2
2004 149 83 8 3 8 1
2005 39 94 40 11 2 20 3
2006 82 91 83 18 3 2 4
2007 87 175 48 43 9 1 3
2008 99 45 37 5 4 2
2009 229 179 33 24 1 2
Warm Regime - atlantic mackerel
2010 160 237 74 9 13 3
2011 309 76 93 20 3 1
2012 221 128 19 27 4 1
2013 148 184 126 5 8 1
2014 100 71 73 14
2015 273 208 46 36 8
2016 188 198 65 5 3 2
2017 26 219 127 28 3 3
2018 88 5 141 33 3 1
2019 119 218 8 117 10 5

black sea bass

Black Sea Bass - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - black sea bass
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983 1 4
1984 8 8 8 7 2 2
1985 19 12 12 14 3 1
1986 16 55 24 1 1
1987 9 60 34 9 4 3
1988 7 31 38 14 1 3 1
1989 7 41 12 3 1 1
1990 17 32 24 4 2 1
1991 27 24 3 3 1
1992 15 69 52 9 2 1
1993 5 26 32 5
1994 11 9 28 14 6 2 1
1995 30 25 14 3 1
1996 12 30 24 9 4 3
1997
1998 4 35 15 10 1 1
1999 28 18 28 13 2 1
2000 10 9 12 2
2001 19 67 27 7 1
2002 46 36 56 40 4 1 2 1
2003 7 57 43 37 19 2 1
2004 20 46 40 22 29 7 1
2005 16 22 10 33 5 16
2006 20 22 12 14 12 5 1
2007 28 34 11 10 1 3 2
2008 19 14 13 2 1 1
2009 113 104 45 20 4 4 1
Warm Regime - black sea bass
2010 68 95 86 47 28 9 2 7 1
2011 62 45 44 39 15 7 1 1
2012 157 60 34 22 16 6 2 1 1
2013 44 200 59 48 25 10 1 3
2014 31 59 107 18 13 8 7 4 1
2015 41 62 42 66 14 10 5 1 1
2016 58 64 48 34 102 6 5 5 1
2017 29 123 51 16 15 42 2 4 2
2018 24 75 83 31 15 8 25 2
2019 73 34 73 68 10 4 7

butterfish

Butterfish - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6
Early Regime - butterfish
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982 129 64 26 7 2
1983 137 76 18 2 3
1984 92 76 29 1
1985 163 44 20 6
1986 105 93 15 2
1987 125 66 16 2
1988 67 60 7 1
1989 61 41 18 1
1990 95 50 12 2
1991 188 57 17 1
1992 243 109 15 1
1993 249 79 27
1994 229 132 29 4
1995 383 190 20
1996 153 120 35 2
1997 374 71 15
1998 206 90 19
1999 161 78 12
2000 299 75 18 3
2001 243 167 18
2002 207 117 56 5
2003 176 45 28 8 1
2004 196 34 8 4
2005 95 75 29 11 2
2006 276 66 24 9
2007 357 85 31 4
2008 238 77 18 3
2009 401 126 43 9 1
Warm Regime - butterfish
2010 534 146 52 3 2
2011 366 149 46 20 3
2012 601 184 70 24 1
2013 325 160 75 16 1 3
2014 418 107 52 8 3
2015 390 220 47 9 1
2016 449 186 78 1
2017 226 138 68 13 1
2018 362 173 92 8 2
2019 350 146 71 9 1

haddock

Haddock - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - haddock
1970 40 19 3 16 14 27 146 52 13 8 7
1971 74 22 1 14 3 12 126 25 3 6
1972 150 2 51 15 3 8 8 2 74 14 13
1973 132 160 1 38 7 10 3 7 95 18
1974 78 143 77 9 1 1 4 2 1 32
1975 36 148 142 95 10 2 3 1 15
1976 184 30 79 62 62 8 1 2 16
1977 63 280 34 87 51 44 2 1 11
1978 11 66 389 20 39 56 8 1 1 5
1979 257 29 88 326 36 30 23 5 3 1
1980 57 126 11 40 89 20 10 10 2 1 2
1981 66 97 224 55 65 81 7 9 3
1982 6 74 71 134 20 13 42 1 1 4
1983 47 26 90 41 99 10 7 47 1 2 2
1984 60 70 37 61 27 48 3 8 14 3
1985 7 141 115 18 41 29 46 6 1 8
1986 62 9 137 46 20 25 11 16 5 2
1987 1 70 12 70 14 12 5 5 3
1988 104 9 83 11 43 13 6 5
1989 12 147 26 53 12 24 5 3 1
1990 36 7 155 12 33 5 8 1
1991 35 40 26 71 8 9 3 4 1
1992 100 32 21 13 50 4 7 3 4
1993 112 127 41 14 16 45 5 1 2
1994 89 124 76 20 9 8 20 4 3 2
1995 112 167 156 63 15 12 7 13 4 1 3
1996 66 93 205 96 53 8 7 3 12 3 2
1997 211 68 82 151 69 31 4 10 5 1 2
1998 145 136 65 101 69 28 7 2 1 3
1999 298 136 159 59 75 57 27 21 7 2 1
2000 140 276 191 117 62 48 38 15 6 2 1
2001 251 149 339 86 70 35 24 16 7 2 1
2002 89 338 180 330 72 37 31 22 14 8 2
2003 28 74 234 99 345 41 33 9 11 7 8
2004 458 42 78 367 70 216 26 31 7 8 14
2005 49 663 22 61 301 69 150 17 9 1 3
2006 181 47 678 17 46 155 48 110 12 5 2
2007 124 213 33 670 9 19 67 15 42 4 2
2008 91 106 129 9 449 5 14 30 10 26 2
2009 117 103 95 119 20 595 9 15 29 6 26
Warm Regime - haddock
2010 191 102 108 69 116 25 723 6 28 26
2011 718 121 62 36 51 72 21 422 3 4 22
2012 286 680 76 28 28 34 47 11 181 3 10
2013 415 191 697 39 16 23 27 23 4 105 2
2014 1340 374 216 762 23 15 11 15 12 2 26
2015 170 1450 311 186 808 27 5 3 10 6 13
2016 433 138 1703 198 127 578 12 2 5 7 4
2017 350 260 85 1451 100 57 290 12 3
2018 146 275 105 47 1065 49 25 103 4 1 1
2019 169 106 213 86 60 1212 36 14 39

pollock

Pollock - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - pollock
1970 22 12 15 22 12 10 7 8 5 4 21
1971 18 34 29 12 11 17 3 13 5 7 30
1972 69 58 25 7 7 9 11 16 4 5 32
1973 3 104 19 22 19 14 7 15 1 22 18
1974 12 58 23 9 17 12 1 2 16
1975 12 19 20 26 9 10 9 5 3 5 30
1976 5 17 17 35 45 20 18 17 8 3 39
1977 15 29 19 16 26 37 17 15 4 3 15
1978 3 31 18 12 19 15 32 19 18 7 28
1979 22 7 36 28 26 25 16 30 18 11 28
1980 22 9 10 18 21 18 14 9 8 5 14
1981 1 31 16 7 9 11 4 5 3 8 18
1982 6 28 32 19 2 14 7 5 5 1 6
1983 29 4 7 8 4 3 5 10 3 3 21
1984 15 26 10 7 12 6 2 3 4 1 7
1985 29 5 32 22 33 33 10 4 7 14
1986 15 38 19 19 12 11 15 4 3 2 16
1987 11 28 10 3 3 3 10 9 5 7
1988 33 9 24 15 5 6 3 4 3 3 15
1989 28 22 18 22 12 13 8 8 2 5 8
1990 5 10 42 13 7 7 5 5 6 4 8
1991 21 22 30 50 32 19 11 2 2 6
1992 34 48 29 26 20 11 7 5 2 8
1993 35 45 33 17 10 19 5 3 1 1 2
1994 3 20 35 26 19 14 7 5 1 1 2
1995 8 26 52 40 31 18 10 6 2 1
1996 25 22 8 23 24 10 6 2
1997 40 50 36 63 69 16 13 1 3 1
1998 66 40 52 22 12 22 18 7 4
1999 43 90 44 44 21 21 10 2
2000 76 65 31 12 13 9 4 2 1
2001 28 59 51 43 40 25 16 6 2 1
2002 29 27 45 53 38 28 12 2
2003 14 69 19 46 22 13 4 2 2
2004 18 41 55 23 39 17 10 1 2
2005 3 52 15 31 36 78 25 11 4 2
2006 24 16 15 7 13 35 59 5 1 1
2007 29 17 23 13 31 48 42 5 2
2008 48 21 10 10 16 19 51 22 27 11 8
2009 22 36 12 3 10 5 4 21 8 2 3
Warm Regime - pollock
2010 21 16 25 19 16 11 13 18 9 3 6
2011 57 28 25 34 32 33 13 13 10 5 6
2012 63 44 18 8 22 13 15 6 7 6 9
2013 11 56 40 12 4 10 6 10 4 3 5
2014 55 50 90 28 18 5 10 3 1 2
2015 12 95 46 49 28 23 8 19 6 3 3
2016 1 29 140 83 65 23 11 6 4 3
2017 3 19 30 45 25 36 9 6 2 1
2018 2 16 13 17 25 10 18 9 2
2019 2 5 13 9 17 43 15 17 2

scup

Scup - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - scup
1970
1971 1
1972
1973 1 1 1
1974
1975
1976 2 1
1977 34 38 7 13 3 1 2 1
1978 31 18 35 12 11 7 2 1
1979 50 34 5 17 10 5 5 2 1
1980 38 35 15 6 8 5 1 2 1
1981 42 36 20 4 3 2 4
1982 36 23 25 10 4 7 1 1
1983 35 8 6 1
1984 24 8 2 2 2
1985 38 22 9 2 1
1986 39 36 4 1
1987 32 28 33 10 2 3 1 1 1
1988 15 10 2 2 1 2
1989 33 25 4
1990 10 24 14 6 1 6 1
1991 46 9 18 6
1992 88 46 7 4 4 1
1993 14 31 5 2 1
1994 11 6 4 2
1995 37 19 6 4
1996 23 14 5 2
1997 5 22 9
1998 48 4 3
1999 37 19 1 1
2000 44 18 12 1 1
2001 72 28 6 2 1
2002 73 35 41 20 3
2003 49 28 8 9 3
2004 39 25 18 7 9 1
2005 55 23 5 5 3 1
2006 72 14 11 7 5 8 1
2007 48 19 17 2 5 4 2
2008 36 19 20 6 5 6 3 4
2009 77 21 9 2 1
Warm Regime - scup
2010 127 75 44 38 23 11 1 6 1 1
2011 115 31 19 18 12 3 1 1
2012 137 37 10 30 13 7 4 1
2013 74 51 18 8 14 5 2 1
2014 43 27 50 30 14 5 7 8 1 1 3
2015 41 36 16 11 8 6 6 3 2 1 1
2016 120 116 29 17 15 11 12 9 4 5 8
2017 52 60 29 10 6 5 2 1 1
2018 47 37 82 46 20 16 8 8 4 5 1
2019 83 13 28 48 31 6 9 5 3 2 4

silver hake

Silver Hake - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - silver hake
1970
1971
1972
1973 328 713 291 129 39 12 6 3 4
1974 238 178 283 147 53 20 8 2 1
1975 206 394 434 189 80 16 2 1 1 1
1976 182 635 480 224 77 48 19 3 1
1977 272 367 562 342 138 52 36 4 2
1978 404 391 210 263 182 53 7 10
1979 373 529 228 110 148 107 28 6 1 1
1980 117 330 358 134 69 71 56 16 8 3 1
1981 241 231 290 206 77 29 22 24 10
1982 368 372 138 103 88 24 13 7 5 5 2
1983 433 542 156 73 44 29 12 1 1 1
1984 300 427 176 51 17 8 2 1
1985 551 316 321 121 28 5 7 1 1
1986 515 566 158 156 37 5 2
1987 235 584 315 92 58 1 1 1
1988 162 279 367 102 12 3
1989 428 251 287 93 10 2 1
1990 301 384 227 115 22 1
1991 455 500 344 149 48 11 1
1992 711 628 362 113 7 1
1993 872 892 309 133 25
1994 441 1066 506 93 6 1
1995 717 817 400 122 7 1
1996 363 646 467 100 7 2
1997 447 579 409 79 7 1
1998 738 823 418 82 10 4
1999 657 1105 397 104 23 1 1
2000 526 1066 572 118 17 1 1
2001 511 1046 617 196 26 3
2002 470 953 523 103 10 4
2003 887 788 406 106 9 3
2004 689 846 270 101 6 1
2005 456 460 276 44 6 4
2006 837 296 147 73 3 2
2007 1145 525 149 47 16 1 1
2008 697 781 120 24 3 3 1
2009 470 553 392 60 9 3
Warm Regime - silver hake
2010 841 399 231 167 9
2011 686 591 202 141 29 3
2012 505 246 148 36 7 4
2013 651 806 346 171 38 4 1 1
2014 539 587 657 180 62 11 5 3
2015 308 678 464 507 57 29 4
2016 466 305 453 296 298 37 18 2
2017 253 545 88 276 150 103 3 3
2018 161 224 180 23 82 28 9 1
2019 538 729 334 282 33 72 22 16

white hake

White Hake - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - white hake
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982 14 71 131 40 36 8 2 3 2 3
1983 29 111 159 85 20 15 2 1 2 1
1984 16 54 103 78 33 14 6 1 3
1985 72 86 151 85 26 4 2 2
1986 24 249 263 76 45 16 1 1 2 1
1987 12 79 191 55 11 8 3 1 1 2
1988 23 147 107 92 28 7 1 2 1 2
1989 34 130 169 45 25 23 3 1
1990 63 210 189 116 25 6 3 3 2
1991 71 302 286 134 50 11 1 1 1
1992 28 173 383 218 22 10 5 3 1
1993 40 206 313 219 44 7
1994 51 229 243 103 27 14 3 2
1995 44 233 260 83 32 14 9 4 1 1
1996 44 78 142 102 43 8 4 4 4 1
1997 66 100 111 55 14 4 1 1 2
1998 49 187 138 48 15 6 3 2
1999 84 115 167 78 34 12 4 1
2000 40 233 215 79 38 10 3 3 1 1
2001 19 79 205 163 57 20 7 3 1 1 1
2002 57 74 81 110 38 12 7 3 2
2003 31 32 32 38 34 20 9 2 1 1
2004 50 62 66 33 16 6 1 2
2005 63 51 72 61 39 15 18 16 3 3 5
2006 111 80 72 32 21 13 6 11 1 1
2007 64 105 160 67 18 6 4 6 9 2 3
2008 103 139 162 87 12 7 6 2 5 1
2009 247 319 251 189 90 33 11 4 2 5
Warm Regime - white hake
2010 222 394 305 161 79 31 6 6 2 7
2011 147 293 281 170 81 46 16 4 2 2
2012 79 222 235 178 91 46 26 9 4 3
2013 55 171 164 90 25 12 9 3 1 2
2014 39 119 132 114 74 53 22 11 5 2
2015 154 199 192 157 99 27 11 5 3 3
2016 110 273 306 192 105 32 8 3 1 1
2017 71 102 145 145 139 55 20 5
2018 70 145 87 66 49 23 16 2 2 1 1
2019 165 225 220 179 93 48 25 10 5 2

winter flounder

Winter Flounder - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - winter flounder
1970
1971
1972
1973
1974
1975
1976 18 55 76 32 25 12 13 6 2 1
1977 1 28 58 27 16 5 1 5 2 2 1
1978
1979
1980 6 106 115 44 30 15 3 1 2
1981 39 79 145 70 22 16 15 6 2 2
1982 43 93 75 44 16 11 3 4 2
1983 17 60 112 67 45 26 18 10 4 1 2
1984 11 45 80 68 29 15 12 11 1 2 4
1985 11 56 73 48 27 15 12 2 1
1986 31 62 84 32 16 12 3 2 1 1 2
1987 7 90 78 41 14 6 5 2 1
1988 24 41 107 68 21 9 3 2 1
1989 7 65 48 40 25 5 4 1
1990 12 56 96 37 19 11 1 2 3 2
1991 11 70 99 49 24 4 3 1
1992 15 110 90 53 25 10 4 1
1993 38 58 64 36 11 5 6 1 1
1994 43 151 102 51 25 13 1
1995 49 120 131 53 22 9 6 1
1996 29 111 114 91 32 18 9 2 1
1997 38 111 146 79 38 10 6 1 1
1998 57 131 175 112 37 6 2
1999 67 154 139 102 67 23 7 3
2000 49 138 180 93 86 46 12 5 5
2001 36 86 129 122 58 42 28 6 2
2002 26 140 128 139 90 45 40 13 8 1
2003 27 51 99 87 61 41 20 6
2004 63 70 61 74 38 32 20 4 2
2005 27 102 82 84 62 51 13 5 1 1 1
2006 41 97 111 82 71 17 5 1
2007 46 78 83 70 66 31 9 3 1
2008 75 144 117 75 61 32 4 2 4 1 3
2009 95 260 225 146 87 59 16 9 4 3 8
Warm Regime - winter flounder
2010 83 182 243 153 101 65 28 8 6 1 8
2011 86 113 210 149 99 41 28 8 4 1 4
2012 95 197 187 174 127 58 24 13 6 3 8
2013 81 145 146 98 69 73 24 15 10 3 7
2014 82 95 151 116 59 48 51 38 8 5 8
2015 13 119 111 66 62 30 30 32 10 5 9
2016 124 136 146 59 77 52 22 19 20 10 10
2017 51 98 62 72 50 38 19 9 12 7 8
2018 68 71 78 41 38 17 25 9 9 6 11
2019 37 89 70 59 25 20 19 18 12 4 10

witch flounder

Witch Flounder - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - witch flounder
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982 5 17 17 17 23 20 8 8 22
1983 1 18 34 37 27 19 15 11 4 29
1984 4 34 41 34 29 16 10 7 33
1985 6 24 40 37 35 25 10 10 36
1986 3 6 8 13 31 40 36 14 12 2 30
1987 1 5 13 11 22 11 1 3 9
1988 1 1 26 6 5 11 30 14 7 5 9
1989 2 5 9 44 12 7 5 21 6 1 8
1990 5 11 22 25 19 3 5 4 5 2 10
1991 2 11 52 26 23 17 9 11 10 12 8
1992 3 7 29 41 12 12 17 5 12 3 13
1993 46 16 26 62 41 17 20 16 3 7 15
1994 21 39 42 34 55 15 14 3 8 2 8
1995 15 42 86 59 43 39 11 10 3 6 6
1996 6 18 41 78 75 37 10 5 2 5
1997 18 31 31 68 77 41 28 5 1 2
1998 24 88 83 57 78 72 31 18 7 1 3
1999 34 69 85 88 71 39 38 11 4 2
2000 5 34 84 87 56 48 29 17 5 4 1
2001 9 22 56 137 123 74 55 27 16 10 1
2002 20 54 130 119 67 67 39 18 10 11
2003 2 25 71 114 112 81 37 31 12 17
2004 4 4 7 43 76 74 76 50 15 18 24
2005 24 15 9 18 38 51 52 27 20 12 9
2006 11 50 44 25 28 72 67 44 22 9 8
2007 3 28 74 42 35 35 62 18 15 6
2008 4 29 50 102 54 40 42 40 11 8 2
2009 84 69 132 156 192 112 113 96 52 26 10
Warm Regime - witch flounder
2010 74 120 75 102 162 183 74 67 60 25 20
2011 39 112 159 80 92 120 61 37 24 29 20
2012 64 100 175 134 118 164 114 70 40 18 8
2013 56 84 63 122 84 60 72 48 27 10 3
2014 162 131 193 110 181 103 88 88 37 11 8
2015 39 176 213 161 128 186 87 77 35 9 5
2016 51 52 286 137 185 91 117 41 23 12 13
2017 44 82 72 293 88 121 49 83 23 17 28
2018 42 47 64 53 181 58 95 32 29 16 15
2019 102 110 106 93 83 205 84 77 23 23 26

yellowtail flounder

Yellowtail Flounder - Individuals Aged by Year
Numbers Combined from Spring and Fall Surveys
1 2 3 4 5 6 7 8 9 10 >10
Early Regime - yellowtail flounder
1970 98 239 365 262 87 29 11 2 3 2
1971 110 360 321 340 83 27 8 2 1 2
1972 82 300 282 175 130 46 10 2 1
1973 83 223 338 158 97 89 12 5 4 1
1974 102 182 134 132 62 32 25 5 2
1975 75 180 39 31 36 11 4 2 1
1976 47 272 85 30 21 18 10 6 3
1977 84 198 175 40 12 12 5 4 2
1978 167 313 141 75 18 3 8 6 2
1979 179 375 165 63 24 10 6 2 1
1980 85 394 337 179 33 12 4 1 2 1
1981 89 236 155 82 26 7 1 1
1982 43 279 185 73 34 9 4 1 1
1983 16 201 273 49 12 4 4 3 1
1984 32 51 65 84 25 10 3
1985 54 100 37 24 28 4 1
1986 23 185 61 20 8 4
1987 24 35 72 19 11 5 5 2 1
1988 71 55 28 26 21 4 1
1989 21 234 77 25 8 2 1
1990 2 48 257 51 9 2 1
1991 60 35 146 166 39 5
1992 28 95 116 101 18 5
1993 55 53 67 64 3 1
1994 92 105 85 63 37 9 1
1995 20 99 116 74 23 6 4 2 1
1996 21 68 160 107 32 2
1997 61 104 191 116 47 7
1998 73 242 144 78 38 15 2
1999 96 206 247 78 59 13 7 1 1
2000 24 140 159 54 19 17 3
2001 61 111 195 75 30 16 15
2002 54 165 176 90 30 6 10 4
2003 53 131 115 63 24 8 6 4 1
2004 27 98 109 49 18 4 2 1
2005 71 92 141 63 20 2 3 1
2006 158 253 170 87 19 5 2 2
2007 62 376 291 121 31 9 3
2008 33 124 256 81 17 2 1
2009 119 186 277 185 58 8 3
Warm Regime - yellowtail flounder
2010 65 252 331 200 115 18 5 2
2011 86 172 261 206 61 27 3 1
2012 76 240 228 189 78 25 14 1
2013 103 152 214 144 74 17 6 1
2014 65 168 137 118 38 20 3 4 2
2015 15 120 167 74 53 6 1 1
2016 93 105 147 85 32 23 6 4 2
2017 42 66 74 51 33 18 16 3
2018 46 62 58 39 20 7 3 6 2
2019 137 108 56 47 24 27 15 8 4

Size at Age Comparisons

Given that we can’t really construct meaningful VB curves for cohorts with a 10-year window of interest, we need to consider an alternative way of putting some statistics behind our numbers to assess significance.

I think looking at differences in LaA and WaA over periods of interest will be helpful. I think a useful example to emulate is Fig 3 and Table 1 in the attached Neuheimer and Gronkjaer paper. However, instead of using trend lines and slopes, it would be better to do a Welch’s t-test comparing 1970-2009 to 2010-2019 (and plotting means for those periods in the figure).

I’m also still debating whether to use 1970-2009 as the comparison or whether to do just the preceding decade, so seeing Welch’s t-test results for 2000-2009 and 2010-2019 would be helpful too.

Please truncate output values to no more than 3 decimal places so it’s easier to look at. (We’ll want to pull other stats out of the Welch’s t-test for the paper, but for shaping the paper, I’d prefer to see less right now.)

These are the methods to use for the tests and for testing assumptions:

Welch’s Two-Sample T-Test

Bartletts Two-Sample Test

Length at Age

The following tables display the results of two-sample testing comparing the length at age of each species between data from two different periods. Significant differences are highlighted when they occur, and in those rows the larger size period’s mean has been highlighted in green, with the smaller sized period’s mean highlighted in red.

1970-2009 & 2010-2019

american plaice

American Plaice Length at Age - Two-Sample Test
Comparison of 1980-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
american plaice
1 length_cm 1980 44.63 115.4 13.21 13.62 0.00 0.00
2 length_cm 1980 111.80 211.0 19.46 20.38 0.00 0.00
3 length_cm 1980 162.63 247.5 25.49 25.74 0.04 0.00
4 length_cm 1980 181.73 228.2 30.16 30.25 0.47 0.00
5 length_cm 1980 134.50 170.5 34.53 32.82 0.00 0.00
6 length_cm 1980 72.53 130.6 38.24 35.21 0.00 0.83
7 length_cm 1980 34.73 78.9 41.31 36.53 0.00 0.19
8 length_cm 1980 16.30 53.8 44.50 39.07 0.00 0.85
9 length_cm 1980 8.73 32.9 47.15 39.77 0.00 0.03

atlantic cod

Atlantic Cod Length at Age - Two-Sample Test
Comparison of 1970-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
atlantic cod
1 length_cm 1970 75.58 75.1 29.09 28.14 0 0.14
2 length_cm 1970 135.22 145.6 43.17 41.53 0 0.00
3 length_cm 1970 129.28 151.3 55.90 52.56 0 0.00
4 length_cm 1970 100.22 126.3 65.19 60.73 0 0.00
5 length_cm 1970 54.95 60.1 73.23 68.73 0 0.00
6 length_cm 1970 29.73 22.0 80.61 74.96 0 0.09
7 length_cm 1970 14.57 7.1 88.84 81.25 0 0.05

atlantic herring

Atlantic Herring Length at Age - Two-Sample Test
Comparison of 1987-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
atlantic herring
1 length_cm 1987 17.55 26.9 11.59 12.54 0 0.96
2 length_cm 1987 124.96 170.8 16.53 16.13 0 0.00
3 length_cm 1987 162.35 266.2 21.33 20.53 0 0.60
4 length_cm 1987 127.52 196.8 24.10 23.05 0 0.00
5 length_cm 1987 100.13 161.7 25.78 25.07 0 0.00
6 length_cm 1987 74.74 115.4 26.95 26.28 0 0.00
7 length_cm 1987 56.18 69.7 27.71 27.05 0 0.01
8 length_cm 1987 30.30 32.9 28.52 27.69 0 0.00

atlantic mackerel

Atlantic Mackerel Length at Age - Two-Sample Test
Comparison of 1973-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
atlantic mackerel
1 length_cm 1973 62.89 163.20 21.52 21.88 0.00 0.00
2 length_cm 1973 57.42 154.40 27.10 27.04 0.42 0.00
3 length_cm 1973 26.50 77.20 30.92 30.27 0.00 0.00
4 length_cm 1973 13.64 29.40 33.36 31.98 0.00 0.00
5 length_cm 1973 9.17 6.11 35.00 34.42 0.02 0.93

black sea bass

Black Sea Bass Length at Age - Two-Sample Test
Comparison of 1983-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
black sea bass
1 length_cm 1983 20.16 58.7 14.13 13.26 0.00 0.01
2 length_cm 1983 34.27 81.7 21.90 21.61 0.07 0.70
3 length_cm 1983 24.56 62.7 28.64 28.92 0.22 0.13
4 length_cm 1983 12.60 38.9 34.45 34.09 0.36 0.00
5 length_cm 1983 5.25 25.3 38.77 39.73 0.12 0.95

butterfish

Butterfish Length at Age - Two-Sample Test
Comparison of 1982-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
butterfish
1 length_cm 1982 201.71 402.1 13.30 13.12 0.00 0.00
2 length_cm 1982 84.39 160.9 16.07 16.20 0.02 0.49
3 length_cm 1982 22.25 65.1 17.92 17.68 0.01 0.94
4 length_cm 1982 4.00 11.1 18.93 18.58 0.09 0.94

haddock

Haddock Length at Age - Two-Sample Test
Comparison of 1970-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
haddock
1 length_cm 1970 105.26 421.80 26.88 23.44 0 0
2 length_cm 1970 116.53 369.70 37.38 31.96 0 0
3 length_cm 1970 116.42 357.60 45.81 37.88 0 0
4 length_cm 1970 93.95 290.20 50.71 41.72 0 0
5 length_cm 1970 64.26 239.40 54.58 45.23 0 0
6 length_cm 1970 49.50 209.20 56.90 47.04 0 0
7 length_cm 1970 22.42 119.70 60.33 52.20 0 0
8 length_cm 1970 16.64 67.22 62.16 52.95 0 0
9 length_cm 1970 10.06 29.33 63.21 53.86 0 0
10 length_cm 1970 7.79 19.50 67.32 55.95 0 0

pollock

Pollock Length at Age - Two-Sample Test
Comparison of 1970-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
pollock
1 length_cm 1970 23.82 22.7 23.27 25.21 0.00 0.00
2 length_cm 1970 32.48 35.8 33.03 32.76 0.39 0.00
3 length_cm 1970 26.77 44.0 43.48 38.68 0.00 0.15
4 length_cm 1970 22.70 30.4 53.18 46.91 0.00 0.00
5 length_cm 1970 19.98 25.2 62.10 55.04 0.00 0.01
6 length_cm 1970 18.15 20.7 69.64 61.12 0.00 0.67
7 length_cm 1970 13.22 11.8 75.67 67.10 0.00 0.69
8 length_cm 1970 7.97 10.7 80.99 71.54 0.00 0.90

scup

Scup Length at Age - Two-Sample Test
Comparison of 1971-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
scup
1 length_cm 1971 39.21 83.9 13.66 12.29 0 0.02
2 length_cm 1971 21.34 48.3 18.90 18.42 0 0.88
3 length_cm 1971 11.70 32.5 22.90 22.36 0 0.20
4 length_cm 1971 5.60 25.6 25.96 25.28 0 0.00

silver hake

Silver Hake Length at Age - Two-Sample Test
Comparison of 1973-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
silver hake
1 length_cm 1973 479.54 494.8 19.21 20.67 0 0.63
2 length_cm 1973 590.78 511.0 25.57 28.47 0 0.00
3 length_cm 1973 334.19 310.3 31.01 34.18 0 0.00
4 length_cm 1973 121.54 207.9 35.91 38.74 0 0.00
5 length_cm 1973 38.49 76.5 39.88 43.91 0 0.00

white hake

White Hake Length at Age - Two-Sample Test
Comparison of 1982-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
white hake
1 length_cm 1982 55.32 111.2 27.16 28.98 0 0.00
2 length_cm 1982 140.50 214.3 35.74 37.44 0 0.00
3 length_cm 1982 172.21 206.7 45.85 45.03 0 0.00
4 length_cm 1982 91.82 145.2 57.69 53.19 0 0.00
5 length_cm 1982 31.89 83.5 67.54 60.76 0 0.00
6 length_cm 1982 11.75 37.3 75.62 68.39 0 0.01
7 length_cm 1982 4.77 15.9 81.64 75.06 0 0.74

winter flounder

Winter Flounder Length at Age - Two-Sample Test
Comparison of 1976-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
winter flounder
1 length_cm 1976 33.09 72.0 20.50 19.01 0 0.00
2 length_cm 1976 94.31 124.5 27.24 26.28 0 0.00
3 length_cm 1976 106.94 140.4 32.63 30.77 0 0.00
4 length_cm 1976 69.25 98.7 36.65 34.95 0 0.28
5 length_cm 1976 39.56 70.7 39.93 37.74 0 0.06
6 length_cm 1976 20.38 44.2 42.82 39.86 0 0.19
7 length_cm 1976 10.00 27.0 46.19 40.94 0 0.31
8 length_cm 1976 4.21 16.9 49.86 42.81 0 0.35

witch flounder

Witch Flounder Length at Age - Two-Sample Test
Comparison of 1982-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
witch flounder
1 length_cm 1982 14.77 67.3 13.56 14.44 0.00 0.15
2 length_cm 1982 26.83 101.4 20.00 22.05 0.00 0.00
3 length_cm 1982 39.61 140.6 24.57 26.88 0.00 0.86
4 length_cm 1982 54.50 128.5 29.47 30.60 0.00 0.00
5 length_cm 1982 54.46 130.2 33.18 33.10 0.53 0.00
6 length_cm 1982 41.46 129.1 36.17 35.16 0.00 0.00
7 length_cm 1982 36.64 84.1 39.28 37.22 0.00 0.32
8 length_cm 1982 22.11 62.0 41.82 39.46 0.00 0.59

yellowtail flounder

Yellowtail Flounder Length at Age - Two-Sample Test
Comparison of 1970-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
yellowtail flounder
1 length_cm 1970 66.38 72.8 20.90 20.02 0.00 0.00
2 length_cm 1970 178.57 144.5 29.11 28.82 0.01 0.01
3 length_cm 1970 168.82 167.3 34.02 33.46 0.00 0.00
4 length_cm 1970 91.33 115.3 36.86 36.41 0.00 0.00
5 length_cm 1970 33.67 52.8 39.60 39.34 0.18 0.00
6 length_cm 1970 12.28 18.8 41.30 41.36 0.86 0.00

Weight at Age

The following tables display the results of two-sample testing comparing the weight at age of each species between data from two different periods. Significant differences are highlighted when they occur, and in those rows the larger size period’s mean has been highlighted in green, with the smaller sized period’s mean highlighted in red.

1970-2009 & 2010-2019

american plaice

American Plaice Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
american plaice
1 indwt 1992 59.44 110.2 0.02 0.02 0 0.00
2 indwt 1992 139.44 210.7 0.05 0.07 0 0.00
3 indwt 1992 191.67 247.5 0.13 0.15 0 0.00
4 indwt 1992 220.56 228.2 0.22 0.25 0 0.00
5 indwt 1992 166.67 170.5 0.35 0.32 0 0.42
6 indwt 1992 87.33 130.6 0.49 0.40 0 0.00
7 indwt 1992 38.94 78.8 0.61 0.46 0 0.00
8 indwt 1992 16.78 53.8 0.76 0.58 0 0.00
9 indwt 1992 8.33 32.9 0.91 0.62 0 0.00

atlantic cod

Atlantic Cod Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
atlantic cod
1 indwt 1992 65.33 74.9 0.24 0.26 0.03 0.21
2 indwt 1992 118.00 145.5 0.83 0.77 0.00 0.00
3 indwt 1992 122.11 151.2 1.73 1.55 0.00 0.00
4 indwt 1992 103.06 126.3 2.70 2.36 0.00 0.00
5 indwt 1992 60.61 60.0 3.76 3.44 0.00 0.00
6 indwt 1992 29.28 22.0 4.94 4.46 0.01 0.00
7 indwt 1992 13.17 7.1 6.65 5.46 0.00 0.01

atlantic herring

Atlantic Herring Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
atlantic herring
1 indwt 1992 19.41 26.9 0.01 0.02 0 0.01
2 indwt 1992 144.78 170.6 0.04 0.04 0 0.00
3 indwt 1992 193.11 266.0 0.08 0.08 0 0.01
4 indwt 1992 146.22 196.8 0.12 0.11 0 0.00
5 indwt 1992 119.22 161.6 0.15 0.14 0 0.00
6 indwt 1992 92.17 115.4 0.17 0.16 0 0.00
7 indwt 1992 68.11 69.6 0.19 0.17 0 0.00
8 indwt 1992 33.39 32.9 0.20 0.18 0 0.00

atlantic mackerel

Atlantic Mackerel Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
atlantic mackerel
1 indwt 1992 110.78 163.10 0.09 0.10 0.00 0.00
2 indwt 1992 94.56 154.40 0.17 0.18 0.00 0.00
3 indwt 1992 39.89 77.20 0.27 0.26 0.18 0.00
4 indwt 1992 19.33 29.40 0.35 0.32 0.00 0.00
5 indwt 1992 9.44 6.11 0.43 0.40 0.02 0.72

black sea bass

Black Sea Bass Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
black sea bass
1 indwt 1992 24.12 58.7 0.06 0.04 0.00 0.00
2 indwt 1992 33.59 81.6 0.16 0.15 0.00 0.61
3 indwt 1992 24.00 62.7 0.34 0.34 0.51 0.42
4 indwt 1992 15.69 38.9 0.60 0.53 0.00 0.00
5 indwt 1992 6.92 25.3 0.81 0.84 0.51 0.08

butterfish

Butterfish Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
butterfish
1 indwt 1992 243.11 401.9 0.05 0.05 0.58 0.27
2 indwt 1992 94.78 160.9 0.08 0.09 0.00 0.00
3 indwt 1992 24.06 65.1 0.11 0.11 0.31 0.02
4 indwt 1992 5.25 11.1 0.13 0.13 0.52 0.59

haddock

Haddock Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
haddock
1 indwt 1992 147.44 421.60 0.19 0.14 0 0
2 indwt 1992 160.44 369.70 0.49 0.35 0 0
3 indwt 1992 154.56 357.60 0.85 0.57 0 0
4 indwt 1992 132.67 290.20 1.15 0.75 0 0
5 indwt 1992 100.00 239.40 1.49 0.95 0 0
6 indwt 1992 78.39 209.20 1.67 1.06 0 0
7 indwt 1992 29.11 119.70 1.99 1.38 0 0
8 indwt 1992 18.72 67.22 2.10 1.45 0 0
9 indwt 1992 10.76 29.33 2.30 1.52 0 0
10 indwt 1992 5.13 19.50 2.52 1.76 0 0

pollock

Pollock Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
pollock
1 indwt 1992 30.06 22.6 0.14 0.18 0.00 0.68
2 indwt 1992 41.22 35.8 0.38 0.40 0.12 0.46
3 indwt 1992 31.39 44.0 0.82 0.67 0.00 0.20
4 indwt 1992 27.83 30.4 1.46 1.13 0.00 0.00
5 indwt 1992 25.78 25.2 2.31 1.78 0.00 0.00
6 indwt 1992 22.67 20.7 3.34 2.41 0.00 0.02
7 indwt 1992 16.83 11.8 4.36 3.12 0.00 0.00
8 indwt 1992 6.00 10.7 4.99 3.83 0.00 0.01

scup

Scup Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
scup
1 indwt 1992 42.89 83.9 0.06 0.04 0.00 0.00
2 indwt 1992 20.17 48.3 0.15 0.14 0.04 0.11
3 indwt 1992 10.11 32.5 0.27 0.25 0.00 0.46
4 indwt 1992 4.80 25.6 0.43 0.37 0.00 0.57

silver hake

Silver Hake Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
silver hake
1 indwt 1992 637.44 482.3 0.05 0.07 0.00 0.00
2 indwt 1992 767.50 510.5 0.10 0.16 0.00 0.00
3 indwt 1992 371.44 310.1 0.19 0.31 0.00 0.00
4 indwt 1992 93.11 207.8 0.33 0.47 0.00 0.00
5 indwt 1992 10.72 76.5 0.65 0.72 0.02 0.91

white hake

White Hake Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
white hake
1 indwt 1992 66.17 111.1 0.16 0.20 0.00 0.00
2 indwt 1992 138.33 214.1 0.37 0.43 0.00 0.00
3 indwt 1992 170.28 206.6 0.82 0.79 0.01 0.00
4 indwt 1992 97.61 145.1 1.60 1.31 0.00 0.00
5 indwt 1992 33.00 83.4 2.52 1.93 0.00 0.51
6 indwt 1992 12.06 37.3 3.64 2.83 0.00 0.33
7 indwt 1992 6.25 15.9 4.91 3.81 0.00 0.01

winter flounder

Winter Flounder Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
winter flounder
1 indwt 1992 45.22 70.0 0.12 0.11 0.01 0.00
2 indwt 1992 117.00 123.5 0.29 0.26 0.00 0.87
3 indwt 1992 120.33 140.4 0.48 0.39 0.00 0.00
4 indwt 1992 85.78 98.7 0.65 0.56 0.00 0.00
5 indwt 1992 52.00 70.7 0.85 0.71 0.00 0.00
6 indwt 1992 27.22 44.1 1.01 0.84 0.00 0.00
7 indwt 1992 12.18 27.0 1.31 0.91 0.00 0.00
8 indwt 1992 4.13 16.9 1.63 1.03 0.00 0.00

witch flounder

Witch Flounder Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
witch flounder
1 indwt 1992 20.40 57.5 0.01 0.02 0.00 0.00
2 indwt 1992 32.33 100.9 0.04 0.06 0.00 0.00
3 indwt 1992 53.17 140.5 0.08 0.11 0.00 0.00
4 indwt 1992 71.89 128.5 0.15 0.17 0.00 0.00
5 indwt 1992 71.44 130.1 0.22 0.23 0.01 0.00
6 indwt 1992 53.11 129.1 0.28 0.27 0.03 0.00
7 indwt 1992 45.11 84.1 0.37 0.33 0.00 0.08
8 indwt 1992 26.00 61.9 0.44 0.41 0.00 0.52

yellowtail flounder

Yellowtail Flounder Weight at Age - Two-Sample Test
Comparison of 1992-2009 & 2010-2019 Data
Variable Data Begins N / year Early N / year Late Early Average Late Average p.value bartlett_p
yellowtail flounder
1 indwt 1992 61.39 72.7 0.10 0.09 0 0.00
2 indwt 1992 147.11 144.5 0.23 0.21 0 0.05
3 indwt 1992 166.44 167.2 0.36 0.31 0 0.00
4 indwt 1992 84.11 115.3 0.49 0.41 0 0.00
5 indwt 1992 29.06 52.8 0.68 0.53 0 0.00
6 indwt 1992 7.88 18.8 0.90 0.62 0 0.00

Condition Factor at Age

The following tables display the results of two-sample testing comparing fulton’s condition factor at age of each species between data from two different periods. Significant differences are highlighted when they occur, and in those rows the larger size period’s mean has been highlighted in green, with the smaller sized period’s mean highlighted in red.

1970-2009 & 2010-2019

Size at Maturity

Length and weight at first maturity for each species has been taken from NOAA fisheries and stock assessment report citations when no webpage was available. Values reported in the table below are either the higher value of a 1-year range given, or the middle value of 3-year ranges reported. References can be found in the decadal variability folder on Box.

Significant Growth Differences

With the exception of silver hake, all species in these tests are significantly smaller at older ages. There are instances where species are larger at their earliest ages (1-4 years of age), but their growth then plateaus and they ultimately reach a smaller adult size. Black sea bass is another possible exception, showing some age-classes with smaller lengths and weights, but not in a consistent pattern with increasing age.

1970-2009 vs. 2009-2019

Length at Age Percent Change
1970-2009 to 2010-20191
Weight at Age Percent Change
1992-2009 to 2010-20191
American Plaice
Atlantic Cod
Atlantic Herring
Atlantic Mackerel
Black Sea Bass
Butterfish
Haddock
Pollock
Scup
Silver Hake
White Hake
Winter Flounder
Witch Flounder
Yellowtail Flounder
1 Colored bars indicate the magnitudes of significant changes in an ageclass characteristics moving from the period of 1970-2009 to individuals from 2010-2019. Bars filled in yellow indicate significant declines in length or weight. Bars colored in blue indicate significant increases in length or weight. And bars in gray indicate no significance in difference in ageclass characteristics.

Size at Age in Time

The following two sets of figures display what the average length or weight was each year for a given species. Means have been overlaid for the groups of years we are comparing above.

Length at Age

american plaice

atlantic cod

atlantic herring

atlantic mackerel

black sea bass

butterfish

haddock

pollock

scup

silver hake

white hake

winter flounder

witch flounder

yellowtail flounder

Weight at Age

american plaice

atlantic cod

atlantic herring

atlantic mackerel

black sea bass

butterfish

haddock

pollock

scup

silver hake

white hake

winter flounder

witch flounder

yellowtail flounder

Cohort Decadal Growth Differences

The following figures display what the average length or weight was for individuals born in a given decade. Means for each decade have been overlaid. No data for individuals born before 1970 were included here.

Decadal Length

american plaice

atlantic cod

atlantic herring

atlantic mackerel

black sea bass

butterfish

haddock

pollock

scup

silver hake

white hake

winter flounder

witch flounder

yellowtail flounder

Decadal Weight

american plaice

atlantic cod

atlantic herring

atlantic mackerel

black sea bass

butterfish

haddock

pollock

scup

silver hake

white hake

winter flounder

witch flounder

yellowtail flounder

Saving Results:

Comparison Test Results

Change in Growth Table

Regime Comparison Figures

Decadal Size at Age Figures